"""Workout logging routes for inline set tracking.

Handles creating, editing, and deleting individual set logs.
All responses are HTMX partials that update in place.
"""

from datetime import date

import structlog
from fastapi import APIRouter, Depends, Request
from fastapi.responses import HTMLResponse
from sqlmodel import Session

from app.database import get_db_session
from app.models.user import User
from app.services.log_service import LogService
from app.services.progression_service import ProgressionService
from app.services.workout_session_service import WorkoutSessionService
from app.utils.auth import require_active_profile, get_active_profile_id

logger = structlog.get_logger(__name__)

router = APIRouter(prefix="/log", tags=["logging"])


def _normalize_weight(raw: str) -> str:
    """Convert numeric weight input to display format.

    '0' or '' -> 'BW', bare number -> '{n} lbs', already formatted -> pass through.
    """
    raw = raw.strip()
    if not raw or raw == "0":
        return "BW"
    try:
        num = float(raw)
        if num == int(num):
            return f"{int(num)} lbs"
        return f"{num} lbs"
    except ValueError:
        return raw


def _get_prefill_values(
    logs: list,
    session: Session,
    profile_id: int,
    exercise_id: int,
) -> tuple:
    """Get pre-fill values for the next set form.

    If sets have already been logged this session, use the last logged
    set's values (users typically repeat the same reps/weight across sets).
    Otherwise, use the progression engine's suggestion.

    Returns:
        (suggested_reps, suggested_weight) tuple.
    """
    if logs:
        last = logs[-1]
        return last.reps_completed, last.weight_used

    progression = ProgressionService(session)
    suggestion = progression.get_suggestion(profile_id, exercise_id)
    return suggestion.get("suggested_reps"), suggestion.get("suggested_weight")


@router.post("", response_class=HTMLResponse)
async def log_set(
    request: Request,
    session: Session = Depends(get_db_session),
    profile: User = Depends(require_active_profile),
):
    """Log a single set for an exercise.

    Creates the workout session if it doesn't exist yet (auto-create).
    Returns the updated log entries partial for this exercise.
    """
    form = await request.form()
    exercise_id = int(form.get("exercise_id", 0))
    workout_day_id = int(form.get("workout_day_id", 0))
    set_number = int(form.get("set_number", 1))
    reps = int(form.get("reps", 0))
    weight = _normalize_weight(form.get("weight", ""))
    felt_easy = form.get("felt_easy") == "on"

    # Get or create today's session
    ws_service = WorkoutSessionService(session)
    ws = ws_service.get_or_create_session(
        user_id=profile.id,
        workout_day_id=workout_day_id,
        session_date=date.today(),
    )

    # Create the log entry
    log_service = LogService(session)
    log_service.create_log(
        session_id=ws.id,
        exercise_id=exercise_id,
        set_number=set_number,
        reps_completed=reps,
        weight_used=weight,
        felt_easy=felt_easy,
    )

    # Return updated logs for this exercise
    logs = log_service.list_logs_for_exercise(ws.id, exercise_id)
    next_set = len(logs) + 1
    suggested_reps, suggested_weight = _get_prefill_values(
        logs, session, profile.id, exercise_id,
    )

    templates = request.app.state.templates
    return templates.TemplateResponse("partials/log_entry.html", {
        "request": request,
        "logs": logs,
        "exercise_id": exercise_id,
        "workout_day_id": workout_day_id,
        "next_set": next_set,
        "session_id": ws.id,
        "suggested_reps": suggested_reps,
        "suggested_weight": suggested_weight,
    })


@router.post("/{log_id}/edit", response_class=HTMLResponse)
async def edit_log(
    log_id: int,
    request: Request,
    session: Session = Depends(get_db_session),
    profile: User = Depends(require_active_profile),
):
    """Edit an existing log entry."""
    form = await request.form()
    log_service = LogService(session)

    log_service.update_log(
        log_id,
        reps_completed=int(form.get("reps", 0)),
        weight_used=_normalize_weight(form.get("weight", "")),
        felt_easy=form.get("felt_easy") == "on",
        notes=form.get("notes"),
    )

    log = log_service.get_log_by_id(log_id)
    logs = log_service.list_logs_for_exercise(log.session_id, log.exercise_id)
    next_set = len(logs) + 1

    active_profile_id = get_active_profile_id(request)
    suggested_reps, suggested_weight = None, None
    if active_profile_id:
        suggested_reps, suggested_weight = _get_prefill_values(
            logs, session, active_profile_id, log.exercise_id,
        )

    templates = request.app.state.templates
    return templates.TemplateResponse("partials/log_entry.html", {
        "request": request,
        "logs": logs,
        "exercise_id": log.exercise_id,
        "workout_day_id": 0,
        "next_set": next_set,
        "session_id": log.session_id,
        "suggested_reps": suggested_reps,
        "suggested_weight": suggested_weight,
    })


@router.post("/{log_id}/delete", response_class=HTMLResponse)
async def delete_log(
    log_id: int,
    request: Request,
    session: Session = Depends(get_db_session),
    profile: User = Depends(require_active_profile),
):
    """Delete a log entry."""
    log_service = LogService(session)
    log = log_service.get_log_by_id(log_id)

    if log:
        exercise_id = log.exercise_id
        session_id = log.session_id
        log_service.delete_log(log_id)

        logs = log_service.list_logs_for_exercise(session_id, exercise_id)
        next_set = len(logs) + 1

        active_profile_id = get_active_profile_id(request)
        suggested_reps, suggested_weight = None, None
        if active_profile_id:
            suggested_reps, suggested_weight = _get_prefill_values(
                logs, session, active_profile_id, exercise_id,
            )

        templates = request.app.state.templates
        return templates.TemplateResponse("partials/log_entry.html", {
            "request": request,
            "logs": logs,
            "exercise_id": exercise_id,
            "workout_day_id": 0,
            "next_set": next_set,
            "session_id": session_id,
            "suggested_reps": suggested_reps,
            "suggested_weight": suggested_weight,
        })

    return HTMLResponse("")